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新标准HJ 491-2019中写明代替HJ 491-2009,自本标准实施之日起,HJ 491-2009废止,GB/T 17138-1997和GB/T 17139-1997在相应的环境质量标准和污染物排放(控制)标准实施中停止执行,那么GB/T 17138-1997和GB/T 17139-1997这两个标准是在HJ 491-2019实施之后自行废止还是继续有效?HJ 491-2019标准的前言中并没有提到这两个标准的废止情况